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SevenZip (.sevenzip)

.sevenzip file signature | application/x-7z-compressed

SevenZip is a compressed archive file format developed by Igor Pavlov and maintained through the 7-Zip project. It is used to package and compress one or more files for software distribution, backups, and general data archiving, and is supported by 7-Zip and many compatible archiver applications. The format is generally safe, though like other archives it should be handled carefully when opened from untrusted sources because files inside may contain malware.

Safe

Magic Bytes

Offset 0
37 7A BC AF 27 1C

Sources: Neil Harvey FileSignatures

Extension

.sevenzip

MIME Type

application/x-7z-compressed

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .sevenzip files in Python

Python 
def is_sevenzip(file_path: str) -> bool:
    """Check if file is a valid SEVENZIP by magic bytes."""
    signature = bytes([0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C])
    with open(file_path, "rb") as f:
        return f.read(6) == signature

How to validate .sevenzip files in Node.js

Node.js 
function isSEVENZIP(buffer: Buffer): boolean {
  const signature = Buffer.from([0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C]);
  return buffer.subarray(0, 6).equals(signature);
}

How to validate .sevenzip files in Go

Go 
func IsSEVENZIP(data []byte) bool {
    signature := []byte{0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C}
    if len(data) < 6 {
        return false
    }
    return bytes.Equal(data[:6], signature)
}

API Endpoint

GET /api/v1/sevenzip
curl https://filesignature.org/api/v1/sevenzip

See the full API documentation for all endpoints and parameters.

Related Formats

.7z

Frequently Asked Questions

What is a .sevenzip file?

A .sevenzip file is identified by the magic bytes 37 7A BC AF 27 1C at byte offset 0. SevenZip is a compressed archive file format developed by Igor Pavlov and maintained through the 7-Zip project. It is used to package and compress one or more files for software distribution, backups, and general data archiving, and is supported by 7-Zip and many compatible archiver applications. The format is generally safe, though like other archives it should be handled carefully when opened from untrusted sources because files inside may contain malware.

What are the magic bytes for .sevenzip files?

The magic bytes for SevenZip files are 37 7A BC AF 27 1C at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .sevenzip file?

To validate a .sevenzip file, read the first bytes of the file and compare them against the known magic bytes (37 7A BC AF 27 1C) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .sevenzip files?

The primary MIME type for .sevenzip files is application/x-7z-compressed.

Is it safe to open .sevenzip files?

SevenZip (.sevenzip) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.